What is the output of executing the following code snippet? 

A. 3 3

B. 2 4

C. One of the marked lines (x1, x2, x3, x4) does not compile.

D. Two of the marked lines (x1, x2, x3, x4) do not compile.

E. Three of the marked lines (x1, x2, x3, x4) do not compile.

F. None of the above.

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var e= Executors.newSingleThread Executor (); (1,2,3).parallel(); Runnable r1 = () -> Stream.of Callable r2 = () -> Stream. of (4,5,6).parallel(); Future f1 = e.submit(r1); Future f2 = e.submit(r2); var r= Stream.of (fl.get(), f2.get()) .flatMap (p -> p) .parallelStream () .collect( // x1 // x2 System.out.print(r.get (false) .size() +""+r.get (true) .size()); // x3 // x4 Collectors.groupingByConcurrent (i -> i%2==0));